Thanks very much for the explanation. It took a while for turning my head around as I was thinking of downloading the OpenVPN app then install it on the local server and didn't think that it's actually installed by the script.

I made the purchase on http://www.amahi.org/apps/openvpn but there no sw to download into my headless HDA server. I thought the purchase will let me download the server sw then I can install it on the local HDA server. Am I confused about the process? Thx.